I don't use the wrapping technique. Such as wrapping the scrotum around the penis. I pull the scrotum up past my.... butt crack, honestly covering my anus, like a wedgie. Then I push the penis between my legs.
Blah that all seems so vulgar. Sorry about that.
I wish there was a way for me to visually demonstrate. But I have no drawing skills, and well... I'm not taking pictures =P.